Philips Semiconductors
Product specification
Remote 16-bit I/O expander for I
2
C-bus
PCF8575
handbook, full pagewidth
SDA
SDA
SCL
S
START condition
P
STOP condition
SCL
MBC622
Fig.4 Definition of START and STOP conditions.
SDA
SCL
MASTER
TRANSMITTER /
RECEIVER
SLAVE
TRANSMITTER /
RECEIVER
MASTER
TRANSMITTER /
RECEIVER
MBA605
SLAVE
RECEIVER
MASTER
TRANSMITTER
Fig.5 System configuration.
handbook, full pagewidth
DATA OUTPUT
BY TRANSMITTER
not acknowledge
DATA OUTPUT
BY RECEIVER
acknowledge
SCL FROM
MASTER
S
START
condition
clock pulse for
acknowledgement
MGL539
1
2
8
9
Fig.6 Acknowledgment on the I
2
C-bus.
1999 Apr 07
7